Fuse for high-explosive shells.



H. K. MORE/N.

FUSE FOBHIGH EXPLOSIVE SHELLS.

APPLICATION FILED OCT. 24. 1914.

1,169,747.3 Patented Jan. 25, 1916.

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sns HPATENT rrrc HUGO KARL MOREN, F BOFORS, SWEDEN, ASSIGNOR T0 AKTIEBOLAGET BOFORS- GULLSPANG, OF BOFORS, SWEDEN, A COMPANY LIMITED.

FUSE non H en-EXrLosIvn SHELLS.

Application filed October 24, 1914. Se1'ia1No. 868,395.

To all whom itmay concern: 1

Be it known that I, HUGO KARL Monr'zn, a subject of the Kingof Sweden, residing at Bofors, Sweden, have invented new and useful Improvements in Fuses for High- Explosive Shells, of which the following is a specification.

As a safety device for shell fuses, especially for high explosive shells, a member has already been employed which normally cuts off the channel for leading the fire from the igniting cap to the bursting charge, but which can be caused to leave said channel free under the influence of the centrifugal force caused by the rotation of'the projectile. fuses so as to be adjustable at will for immediate or retarded explosion, the construction has, however, hitherto been very complicated and thus inconvenient.

The present invention provided a solution of the said question of adjusting fuses of the aforesaid kind, which results in a little complicated construction, and which is founded upon the principle that two fire channels lead from the igniting cap, which channels are controlled by one cutting off member, and one of which leads directly to a secondary igniting device, the other to a retarding device which in its turn ignites the secondary device. The movements of the controlling member then are regulated by a device in such manner, that in arming the fuse either both channels or only the one leading to the retarding device is opened, In the former case, the explosion of course takes place immediately, in the latter case it is retarded.

A form of the invention applied to an impact fuse is illustrated in the accompanying drawing where Figures 1 and 2 show the fuse in two different central longitudinal sections, Figs. 3 and i crrss sections on the lines 3 and 4:, respectively, in Fig. 1 in locked (unarmed) position, Fig. 5 a cross section corresponding to Fig. 3 in the position for retarded explosion and Fig. 6 a similar cross section in the position for immediate explosion.

a is the fuse body proper which is externally threaded for being screwed into the front end of the projectile. At its rear end, it has a narrower, similarly threaded por tion on which is screwed a cap 0 filled with an initial charge d, while in a recess therein lVhen it was desired to arrange said.

Patented Jan. 25, 19 16.

"is screwed a cap 6 containing a: deton'ator charge f. In the front end of the fuse, there is screwed a cover I) carryingthe igniting point I), and closing a central recess a:

in which the hammer g and the members controlling its movements, namely, the safety ring it and the spring 2', are adapted to move. In the front portion of the hammer 9, there is arranged an igniting cap 1', from which a fire channel is leads longitudinally through the hammer.

From the bottom of-the recess a, two axial channels 'v, a, lead rearward in the fuse body where they are intersected by a radial cross channel u the outer portion at, of which is wider than the inner one. The axial channel o lying closest to the mouth of the channel u, continues right throughthe fuse body to the detonator charge 7.

The other axial channel, on the contrary, is

continued by a transverse channel n, which in its turn is in communication with the charge f through a channel '0 filled with a retarding charge, for instance compressed, common powder.

The locking or cut off member t is arranged in the transverse channel u It is provided with a longitudinal channel 25 and with two cross channels t 6 which do not run through'but communicate with the longitudinal channel and alsoin the innermost position of the cut off memberwith the front portions of the fire channels '0 1)., respectively. The cut off member further is provides with a head which cooperates with a special safety pin on for controlling the movements of said member.

The safety pin on is arranged in an axial channel Z eccentrically arranged in the fuse body. It is provided with a head having a chamfered portion m on the side facing the pin, as can be seen in Figs. L-G, and at the other end with a threaded portion 0 by means of which it is screwed into another pin 0, a spring at being also squeezed between the two members an and 0. The pin 0 can be rotated from outside together with the pin m. The spring n bears against a sleeve 7' inserted into the channel Z and retained by means of a screw 8.

When the fuse is safe (unarmed), its members occupy the positions shown in Figs. 1-4. In firing the gun, the pin m slides backward by reason of its inertia, carrying forth the member 0 and the spring n which retains the pin after its displace ment. The chamfered portion 'm then is positioned just opposite to the cut ofi-mem ber 23 and according to the positionto which the pins on and 0 have been previously set by rotation, the position will be that shown in Figs. 5 or 6. By reason of thecentrifw] gal force-which then soon occursby the ro= tation of the projectile, the cutoil member t' is pressed outward as soon as the strong friction caused by the acceleration of, the projectile ceases, and it then the safety pin m "occupiestheposition shown in Fig. 5, it will "check themember z in such position as to leave the channel 11 free but still close the charge 7' so that an immediate explosion Will occur. If the igniting cap 7' should be unintentionally ignited before the firing of the gun, the fire will rush out through the channels in, t t and t, without reaching the charge Having now particularly described the nature of my invention and the manner of its operation, what I claim is: y

1. In shell fuses, anelongated body, a primary igniting charge carried by the body, a bursting charge, said body having a plurality of longitudinal channels forming communication between said charges, a radially displaceable plunger member normally crossing said channels so as to cut off the communication, said plunger member beingVdisplaceablein such direction as to opensaid channels successively when displaced by centrifugal action, and a controlling member serving to arrest the plunger member in successive positions.

- 2. In-shell' fuses, an elongated body, a primary igniting charge carried by the body, a bursting'charge, said body having two longitudinal channels forming communication between said'charges, a radially displaceable plunger member crossing said channels to cut oil the communication normally and having a-longitudinalchannel and two cross channels communicating therewith and normally registering with the end portions of each of said first named channels which communicate with the igniting charge, the'plunger being displace able by centrifugal action to .open the communication between'charges, and a controllin'gcmember normallyengaging said plunger so as to prevent its longitudinal displacement.

3. In shell fuses, an elongated body, a primary igniting charge-carried by the body, a bursting charge, said body having two longitudinal channels forming communicaticn between said charges, a radially displaceable plunger member crossing said channels and having one longitudinal channel and two cross channels communicating With the longitudinal channel and normally registering with each of said first named channels, and arotatable and longitudinally dis'place'able controlling member having different locking surfaces which enable it to check the plunger member either in a position for cutting off both of the first named channels, or'in a position for leaving one of said channels free or in a position leaving both channe'lsfree.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. f HUGO KARL MOREN. \Vitnesses: V

PEHRE- ASPELIN, KARL- BILD.

Copies of this patent may be obtained for five cents each, by addressing the f Commissioner of Patents,

Washington, D. C. a v 

